Wire-O or Spiral-Bound Book and comb binding book are simple and widely used in Calendars, manual, notebook, presentations, workbook etc. and can't print on the spine for most of wire-O or spiral bound book printing, they can lay flat or wrap back around themselves.
There's another kind of hidden wire-O or spiral bound book printing, the cover is mount on the surface of the inside pages. No matter what kind of complex binding, it'll becoming simple and easy in CM Color Printing.

CM Color Printing Company: A professional printing services provider in China, Specialized in Book Printing and Packaging Boxes Printing. We can print all kinds of books, packaging boxes, magazines, bags, labels and commecial materials in high quality at low rate.